GLSA-201401-08 : NTP: Traffic amplification

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-201401-08
(NTP: Traffic amplification)

ntpd is susceptible to a reflected Denial of Service attack. Please
review the CVE identifiers and references below for details.

Impact :

An unauthenticated remote attacker may conduct a distributed reflective
Denial of Service attack on another user via a vulnerable NTP server.

Workaround :

We modified the default ntp configuration in =net-misc/ntp-4.2.6_p5-r10
and added &ldquo
noquery&rdquo
to the default restriction which disallows anyone
to query the ntpd status, including &ldquo
monlist&rdquo
.
If you use a non-default configuration, and provide a ntp service to
untrusted networks, we highly recommend you to revise your configuration
to disable mode 6 and 7 queries for any untrusted (public) network.
You can always enable these queries for specific trusted networks. For
more details please see the &ldquo
Access Control Support&rdquo
chapter in the
ntp.conf(5) man page.

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